@Thebestwaytoscareatory so the summary is - you don’t know anything about farming? This is why these threads are tedious, you get people who don’t know anything about it regurgitating random statistics they’ve googled with no way to apply them. Carbon emissions are just part of a small story and talking about farming 20,000 years ago is a pointless waste of time.
If you remove livestock you will have to try and farm they Grade 3/4/5 land they graze, releasing carbon into the atmosphere. Most land is Grade 3 - you can grow some arable crops on some of it, but it’s better for grass.
All farming now is reasonably intensive. It has to be to support billions of people. If you take away livestock, soil health and fertility will decline meaning yields drop. You quickly won’t have enough food to go around, you could use chemical inputs but they are dreadful for the environment. Those 4% of wild mammals you talk of (livestock does graze?) aren’t going to be able to fertilise everything and keep up the soil health. I’m sure it will be enjoyable though when everybody starts to starve because there are no nutrients left in the ground, it’s rife with disease and pests and we’ve sprayed so much pesticide and artificial fertiliser that we’ve killed off everything else. Or we could use livestock in an arable rotation to restore fertility, improve soil health, reduce pests and disease and feed people.
I never claimed to be an expert on farming. You are the one who tried to link farming to the carbon cycle and implied there was a beneficial relationship between the two. My entire post was about dispelling that notion and highlighting that agriculture and in particular animal agriculture is just another man made activity that, in its current form, has a massively negative impact on the environment and climate.
Why you've now moved on to soil health and land productivity is beyond me as that is a completely different issue. I'm well aware of the issues surrounding land use and maintaining a stable supply of foods. However, continuing with our current systems will result in a catastrophic ecological collapse and the displacement and/or death of billions. If we are to survive our entire way of living and consuming has to change.